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ABEL A. ADAMS, OF FELOHVILLE, ASSIGNOR TO RUSSELL W. PINNEYv AND FORRESTL. PINNEY, OF BRIDGEWATER, VERMONT.

Letters Patent No. 82,269, dated September 22, 1868.

IMPROVEMENT 1N HEAD-moors.

TO ALL PERSONS TO WHOM THESE PRESENTS MAY COME:

Be it known that I, ABEL A. ADAMS, of Felchville, of the lcounty ofWindsor, and State of Vermont, have invented a new and usefulImprovement in Head-Blocks for Saw-Mills and do hereby declare the sameto be fully described in the following specification, and represented inthe accompanying drawings, iu which Figure 1 is a top view,

Figure 2 a. front elevation,

Figure 3 a longitudinal section, and

Figure 4 a transverse section of my improved headblock.

In such drawings, A denotes the bed, having applied to it twohead-blocks B C; they being so connected with it as to be capable ofbeing moved rectilinearly therein, in a diretion lengthwise of it.

Each of such head-blocks has a series of dogs, ra a, extending throughstandards b b, arranged on it, and provided with set-screws c c, to holdthe dogs in place after they may have been driven into a log.

Furthermore, there is a rack, e,'to each of the standards, such beingarranged in manner as represented, and for the purpose of enabling aperson, by means of a lever resting at its foot againet one of the teethof a rack, to force back its dog, by pressure against the hook or headthereof. i

The head-blocks are-provided with clamp-serew bolts e e, which screwinto nuts ff, arranged in a dovetailed groove, g, made in the bed; thepurpose of such groove, bolts, andnuts being to enable a person'to clampthe head-block in position on the bed. The saw-port or recess of the bedis shown at 7L.

In rear of such recess is a connection-bar, z', which rests on the bedin grooves made in the twohead-blocks, and is fastened to the block C. Apin, k, goingv down through the head-block B, and into one of a seriesof holes made in the said bar, serves to so connect the auxiliaryhead-block C to Athevprimary head-block B as to enable the former to bemoved by the latter and its operative-mechanism.4 Another pin, c, wheninserted down through the head-block C, and into a hole in the bed A,serves to hold the head-block C stationary on the bed.

There is fixed to the bottom of the primary head-block a rack, l, whichengages with a gear, m, xed on a shaft, n, arranged in manner asrepresented.

There is another gear, o, on and fixed to such shaft.

Furthermore, a lever, 79, so applied to the shaft as to be capable ofturning freely thereon, carries not only a duplex rocker-frame, g,(provided with a working-arm, r,) but also has a sector, s, extendedfrom it, and aside of and over the gear o, in manner asV represented.Through the said sector is a curved slot, t, through which, and amovable stop, u, a .clamp-screw, n, is passed, and screws into athumb-nut, w. The. purpose of the screw and nut is to fix the stop inany desirable position on the periphery of the' sector, on which is ascale of divisional marks and numbers. y i

Another stop-pawl, x, hinged to the bed, and formed and arranged, withrespect to the gear o and sector s, in manner as shown in the drawings,has its free end bevelled, in order that, when pressed against such end,the sector shall force up the stop-pawl, in order that 'the sector maypass underneath it, and the other stoppawl be brought up in contact withit.

An abutment or stop, y, extended from the bed, serves to limit thedescent of 'the lever p, which, when in its lowest position, rests onsuch abutment. A spring, z, extends from the Working-arm, and underneathand against a stud, a', projecting from the lever p. A graduating-pawl,(applied to the front of the bed,) when turned against the gear o,serves to prevent it from being revolved in one direction. 4'

The purpose of the sector s, its adjustable stop u, the hinged stop-pawlas, and the abutment y, is to regulate the amount of vibration of thelever p, in order to e'ect equa-l movements of the head-block, thelength of each ,of such movements depending 'on the distance ofthe stopu from the upper end ofthe sector.

The auxiliary head-block enables sawing to beeifected on one log whilethe otherhead-block is being I moved-back to place for reception ofanother log.

By laying hold of the working-lever, and raising it, while, at the sametime, we raise the lever p, we cause the duplex-pawl to actuate the gearo, in a manner to effect the baokward movement of the main head-block.

By means of the lever p and its wvorking-pawl, we can operate the gear oin either direction, the sector s, the adjustable stop u, the hingedstop-pawl x, and the stationary abutment y serving to regulate thedistance of each vibration of the lever, in order to eiect equalmovements of the head-block or blocks What I claim as my invention is asfollows:

T. claim the combination of the sector s,vits adjustable stop u, andhinged stop-pawl x, wltn une gear o, its operating-lever p, working-pawlg, and abutment y, the same being applied to the bed, and tothe shaftofthe rack-pinion of the main head-block, substantially in manner andfnr the purpose or objects as set forth.

' ABEL A. ADAMS.

Witnesses:

GILBERT A. Dxvls. LUTHER KENDALL.

